odoo-survey-addons/survey_question_duplicate/views/survey_page.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

  <record id="survey_page_form" model="ir.ui.view">
    <field name="name">survey_input_attachment survey.page form</field>
    <field name="model">survey.page</field>
    <field name="inherit_id" ref="survey.survey_page_form"/>
    <field name="priority">20</field>
    <field name="arch" type="xml">
      <xpath expr="//field[@name='question_ids']/tree" position="inside">
        <button type="object" name="copy" string="Dupliquer" icon="fa-copy" class="oe_edit_only"/>
      </xpath>
    </field>
  </record>

</odoo>